Java Screencast: AJAX Development with jMaki and Netbeans 5.5
jMaki is an Ajax framework that provides a lightweight model for reusable Ajax-enabled widgets of your own design or for those extending existing toolkits such as the Dojo toolkit. jMaki facilitates the passing parameters to your widgets and provides the means to better connect your widgets to your server-side resourcess using XML or JSON. Currently the jMaki server-side runtime is provided as a JSP tag library or a JSF component.
See About jMaki to learn more.